import {
  document,
	window,
	HTMLCanvasElement,
	requestAnimationFrame,
	cancelAnimationFrame,
core,
	Event,
  Event0
} from "dhtml-weixin"
import * as THREE from './three/Three';

import { GUI } from 'three/addons/libs/lil-gui.module.min.js';

import { RGBMLoader } from 'three/addons/loaders/RGBMLoader.js';
var requestId
Page({
  onShareAppMessage(){
    return getApp().onShare()
  },
  onShareTimeline(){
     return {title:"ThreeX 2.0"}
  },
	onUnload() {
		cancelAnimationFrame(requestId, this.canvas)
		this.worker && this.worker.terminate()
if(this.canvas) this.canvas = null
		setTimeout(() => {
			if (this.renderer instanceof THREE.WebGLRenderer) {
				this.renderer.dispose()
				this.renderer.forceContextLoss()
				this.renderer.context = null
				this.renderer.domElement = null
				this.renderer = null
			}
		}, 0)
	},
  webgl_touch(e){
		const web_e = (window.platform=="devtools"?Event:Event0).fix(e)
		this.canvas.dispatchEvent(web_e)
  },
  onLoad() {
		document.createElementAsync("canvas", "webgl2").then(canvas => {
      this.canvas = canvas
      this.body_load(canvas).then()
    })
  },
  async body_load(canvas3d) {	

  const params = {
    exposure: 2.0
  };

  let renderer, scene, camera;

  init();

  function init() {

    renderer = new THREE.WebGLRenderer();
    renderer.setPixelRatio( window.devicePixelRatio );
    renderer.setSize( window.innerWidth, window.innerHeight );
    document.body.appendChild( renderer.domElement );

    renderer.toneMapping = THREE.ReinhardToneMapping;
    renderer.toneMappingExposure = params.exposure;


    scene = new THREE.Scene();

    const aspect = window.innerWidth / window.innerHeight;

    camera = new THREE.OrthographicCamera( - aspect, aspect, 1, - 1, 0, 1 );

    new RGBMLoader().setMaxRange( 16 ).load( 'textures/memorial.png', function ( texture ) {

      const material = new THREE.MeshBasicMaterial( { map: texture } );

      const quad = new THREE.PlaneGeometry( 1, 1.5 );

      const mesh = new THREE.Mesh( quad, material );

      scene.add( mesh );

      render();

    } );

    //

    const gui = new GUI();

    gui.add( params, 'exposure', 0, 4, 0.01 ).onChange( render );
    gui.open();

    //

    window.addEventListener( 'resize', onWindowResize );

  }

  function onWindowResize() {

    const aspect = window.innerWidth / window.innerHeight;

    const frustumHeight = camera.top - camera.bottom;

    camera.left = - frustumHeight * aspect / 2;
    camera.right = frustumHeight * aspect / 2;

    camera.updateProjectionMatrix();

    renderer.setSize( window.innerWidth, window.innerHeight );

    render();

  }

  //

  function render() {

    renderer.toneMappingExposure = params.exposure;

    renderer.render( scene, camera );

  }
  }
})